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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 4608 |
| 8 | 33984 |
| 9 | 276288 |
| 10 | 2537184 |
| 11 | 25466944 |
| 12 | 279826088 |
| 13 | 3299556704 |
| 14 | 41853801224 |
| 15 | 573876216960 |
| 16 | 8325351884896 |
[1,2,6,24,120,720,4608,33984,276288,2537184, 25466944,279826088,3299556704,41853801224, 573876216960,8325351884896] |